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M41ST84Y, M41ST84YMQ6E, M41ST85WMX6TR

Table of contents:
Info of M41ST84Y
Info of M41ST84YMQ6E
Info of M41ST85WMX6TR

M41ST84Y, M41ST84YMQ6E, M41ST85WMX6TR Selling Leads, Datasheet

MFG:STMicroelectronics Category:Integrated Circuits (ICs) Package Cooled:SOP D/C:04+

M41ST84Y, M41ST84YMQ6E, M41ST85WMX6TR Datasheet download

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Part Number: M41ST85WMX6TR

Category: Integrated Circuits (ICs)

MFG: STMicroelectronics

Package Cooled: SOP

D/C: 04+

Description: IC RTC 3.0V NVRAM 28SOIC

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M41ST84Y General Description

The M41ST84Y/W Serial supervisory TIMEKEEPER ^® SRAM is a low power 512-bit static CMOS SRAM organized as 64 words by 8 bits. A built-in 32.768 kHz oscillator (external crystal controlled) and 8 bytes of the SRAM (see Table 9, page 16) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 bytes of RAM provide status/control of Alarm, Watchdog and Square Wave functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

The M41ST84Y/W has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the SRAM and clock operations can be supplied by a small lithium button-cell supply when a power failure occurs. Functions available to the user include a non-volatile, time-of-day clock/calendar, Alarm interrupts, Watchdog Timer and programmable Square Wave output. Other features include a Power-On Reset as well as an additional input (RSTIN) which can also generate an output Reset (RST). The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24 hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.

The M41ST84Y/W is supplied in a 28-lead SOIC SNAPHAT^® package (which integrates both crystal and battery in a single SNAPHAT top) or a 16- pin SOIC. The 28-pin, 330mil SOIC provides sockets with gold plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery and crystal. The unique design allows the SNAPHAT battery/crystal package to be mounted on top of the SOIC package after the completion of the surface mount process. Insertion of the SNAPHAT housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface- mounting. The SNAPHAT housing is also keyed to prevent reverse insertion.

The 28-pin SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in Tape & Reel form. For the 28-lead SOIC, the battery/ crystal package (e.g., SNAPHAT) part number is "M4TXX-BR12SH" (see Table 20, page 29). Caution: Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the lithium button-cell battery.

M41ST84Y Maximum Ratings

Symbol	Parameter		Value	Unit
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SNAPHAT^®	40 to 85
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SOIC	55 to 125
T_SLD⁽¹⁾	Lead Solder Temperature for 10 seconds		260
V_IO	Input or Output Voltages		0.3 to V_CC +0.3	V
V_CC	Supply Voltage	M41ST84Y	0.3 to 7	V
V_CC	Supply Voltage	M41ST84W	0.3 to 4.6	V
I_O	Output Current		20	mA
P_D	Power Dissipation		1	W

Note: 1. Reflow at peak temperature of 215°C to 225°C for < 60 seconds (total thermal budget not to exceed 180°C for between 90 to 120 seconds).
CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode.
CAUTION: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.

M41ST84Y Features

` 5.0 OR 3.0V OPERATING VOLTAGE
` SERIAL INTERFACE SUPPORTS I2C BUS (400 KHz)
` OPTIMIZED FOR MINIMAL INTERCONNECT TO MCU
` 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE
` AUTOMATIC SWITCH-OVER and DESELECT CIRCUITRY
` CHOICE OF POWER-FAIL DESELECT VOLTAGES:
    M41ST84Y: V_CC = 4.5 to 5.5V; 4.20V V_PFD 4.50V
    M41ST84W: V_CC = 2.7 to 3.6V; 2.55V V_PFD 2.70V
` 1.25V REFERENCE (for PFI/PFO)
` COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
` 44 BYTES OF GENERAL PURPOSE RAM
` PROGRAMMABLE ALARM and INTERRUPT
    FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE)
` WATCHDOG TIMER
` MICROPROCESSOR POWER-ON RESET
` BATTERY LOW FLAG
` ULTRA-LOW BATTERY SUPPLY CURRENT OF 500 nA (max)
` OPTIONAL PACKAGING INCLUDES A 28-
    LEAD SOIC and SNAPHAT^® TOP (to be ordered separately)
`SNAPHAT PACKAGE PROVIDES DIRECT
   CONNECTION FOR A SNAPHAT TOP, WHICH CONTAINS THE BATTERY and CRYSTAL

M41ST84Y Connection Diagram

M41ST85WMX6TR Parameters

Technical/Catalog Information	M41ST85WMX6TR
Vendor	STMicroelectronics
Category	Integrated Circuits (ICs)
Date Format	YY-MM-DD-dd
Time Format	HH:MM:SS:hh (24 hr)
Voltage - Supply	2.7 V ~ 3.6 V
Interface	I²C, 2-Wire Serial
Memory Size	64B
Package / Case	28-SOIC, 28-SOH (8.48mm Width)
Packaging	Tape & Reel (TR)
Type	Clock/Calendar/Supervisor
Operating Temperature	-40°C ~ 85°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	M41ST85WMX6TR M41ST85WMX6TR

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